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The last half year I've been working on a replacement TTY layer for the FreeBSD kernel. The new TTY layer was designed to improve the following: - Improved driver model: The old TTY layer has a driver model that is not abstract enough to make it friendly to use. A good example is the output path, where the device drivers directly access the output buffers. This means that an in-kernel PPP implementation must always convert network buffers into TTY buffers. If a PPP implementation would be built on top of the new TTY layer (still needs a hooks layer, though), it would allow the PPP implementation to directly hand the data to the TTY driver. - Improved hotplugging: With the old TTY layer, it isn't entirely safe to destroy TTY's from the system. This implementation has a two-step destructing design, where the driver first abandons the TTY. After all threads have left the TTY, the TTY layer calls a routine in the driver, which can be used to free resources (unit numbers, etc). The pts(4) driver also implements this feature, which means posix_openpt() will now return PTY's that are created on the fly. - Improved performance: One of the major improvements is the per-TTY mutex, which is expected to improve scalability when compared to the old Giant locking. Another change is the unbuffered copying to userspace, which is both used on TTY device nodes and PTY masters. Upgrading should be quite straightforward. Unlike previous versions, existing kernel configuration files do not need to be changed, except when they reference device drivers that are listed in UPDATING. Obtained from: //depot/projects/mpsafetty/... Approved by: philip (ex-mentor) Discussed: on the lists, at BSDCan, at the DevSummit Sponsored by: Snow B.V., the Netherlands dcons(4) fixed by: kan
105 lines
3.7 KiB
C
105 lines
3.7 KiB
C
/*-
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* Copyright (c) 1982, 1986, 1993
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* The Regents of the University of California. All rights reserved.
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* (c) UNIX System Laboratories, Inc.
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* All or some portions of this file are derived from material licensed
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* to the University of California by American Telephone and Telegraph
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* Co. or Unix System Laboratories, Inc. and are reproduced herein with
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* the permission of UNIX System Laboratories, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)ttydefaults.h 8.4 (Berkeley) 1/21/94
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* $FreeBSD$
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*/
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/*
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* System wide defaults for terminal state.
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*/
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#ifndef _SYS_TTYDEFAULTS_H_
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#define _SYS_TTYDEFAULTS_H_
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/*
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* Defaults on "first" open.
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*/
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#define TTYDEF_IFLAG (BRKINT | ICRNL | IMAXBEL | IXON | IXANY)
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#define TTYDEF_OFLAG (OPOST | ONLCR)
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#define TTYDEF_LFLAG_NOECHO (ICANON | ISIG | IEXTEN)
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#define TTYDEF_LFLAG_ECHO (TTYDEF_LFLAG_NOECHO \
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| ECHO | ECHOE | ECHOKE | ECHOCTL)
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#define TTYDEF_LFLAG TTYDEF_LFLAG_ECHO
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#define TTYDEF_CFLAG (CREAD | CS8 | HUPCL)
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#define TTYDEF_SPEED (B9600)
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#define TTYDEF_SPEED_PSEUDO (B38400)
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/*
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* Control Character Defaults
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*/
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/*
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* XXX: A lot of code uses lowercase characters, but control-character
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* conversion is actually only valid when applied to uppercase
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* characters. We just treat lowercase characters as if they were
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* inserted as uppercase.
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*/
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#define CTRL(x) ((x) >= 'a' && (x) <= 'z' ? \
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((x) - 'a' + 1) : (((x) - 'A' + 1) & 0x7f))
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#define CEOF CTRL('D')
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#define CEOL 0xff /* XXX avoid _POSIX_VDISABLE */
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#define CERASE CTRL('?')
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#define CERASE2 CTRL('H')
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#define CINTR CTRL('C')
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#define CSTATUS CTRL('T')
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#define CKILL CTRL('U')
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#define CMIN 1
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#define CQUIT CTRL('\\')
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#define CSUSP CTRL('Z')
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#define CTIME 0
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#define CDSUSP CTRL('Y')
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#define CSTART CTRL('Q')
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#define CSTOP CTRL('S')
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#define CLNEXT CTRL('V')
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#define CDISCARD CTRL('O')
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#define CWERASE CTRL('W')
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#define CREPRINT CTRL('R')
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#define CEOT CEOF
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/* compat */
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#define CBRK CEOL
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#define CRPRNT CREPRINT
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#define CFLUSH CDISCARD
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/* PROTECTED INCLUSION ENDS HERE */
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#endif /* !_SYS_TTYDEFAULTS_H_ */
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/*
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* #define TTYDEFCHARS to include an array of default control characters.
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*/
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#ifdef TTYDEFCHARS
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static cc_t ttydefchars[NCCS] = {
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CEOF, CEOL, CEOL, CERASE, CWERASE, CKILL, CREPRINT,
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CERASE2, CINTR, CQUIT, CSUSP, CDSUSP, CSTART, CSTOP, CLNEXT,
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CDISCARD, CMIN, CTIME, CSTATUS, _POSIX_VDISABLE
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};
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#undef TTYDEFCHARS
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#endif
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